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Measles is quite uncommon in populations of highly vaccinated areas, yet when it does occur, it is more commonly seen in adults. [19] The development of the measles vaccine has been vital in reducing outbreaks. Without a measles vaccine, measles epidemics could happen every 2 to 5 years and last up to 3 to 4 months at a time. [22]
The 1990–1991 Philadelphia measles outbreak was a medical event in and around Philadelphia, Pennsylvania, in which over 1,400 people, mostly children, became sick with measles, and nine children died. [1] There were two epicenters for this outbreak within the area: The Faith Tabernacle Congregation and the First Century Gospel Church.
Cases of measles rose from 56 in 1998 to 1370 in 2008, and similar increases occurred throughout Europe. [153] In April 2013, an epidemic of measles in Wales in the UK broke out, which mainly affected teenagers who had not been vaccinated. [154] Despite this controversy, measles has been eliminated from Finland, Sweden and Cuba. [155]
Farr's law is a law formulated by Dr. William Farr when he made the observation that epidemic events rise and fall in a roughly symmetrical pattern. [1] The time-evolution behavior could be captured by a single mathematical formula that could be approximated by a bell-shaped curve .
The graph on the left shows a computer model depicting the possible number of measles infections from an outbreak if the 2017-2018 school vaccination rates in Florida were to drop by 10%.
Occasional measles outbreaks persist, however, because of cases imported from abroad, of which more than half are the result of unvaccinated U.S. residents who are infected abroad and infect others upon return to the United States. [126] The CDC continues to recommend measles vaccination throughout the population to prevent outbreaks like these ...
The worst epidemics and pandemics have ravaged humanity throughout its existence, but which were the deadliest? Some of the worst epidemics and pandemics in history have doomed whole civilizations ...
For a given epidemic or pandemic, the average of its estimated death toll range is used for ranking. If the death toll averages of two or more epidemics or pandemics are equal, then the smaller the range, the higher the rank. For the historical records of major changes in the world population, see world population. [3]